Indian Air Force chief Air Chief Marshal Arup Raha on Saturday said the IAF is prepared to deal with "any challenge" in "most befitting manner".In his message on official Facebook page of the IAF -- Indian Air Force, Power to Punish -- the Air Force chief said the force is operating some of the most modern weapon and equipment and the air warriors exercise ceaseless vigil of skies."We continue to train to take up any threat and are fully prepared to undertake any challenge in most befitting manner," the IAF chief said.The official Facebook page of IAF was launched on Saturday on 84th Air Force Day.The Air Force Day is celebrated to commemorate the day the force was officially established, October 8, 1932.